/**
 * This version is stamped on May 10, 2016
 *
 * Contact:
 *   Louis-Noel Pouchet <pouchet.ohio-state.edu>
 *   Tomofumi Yuki <tomofumi.yuki.fr>
 *
 * Web address: http://polybench.sourceforge.net
 */
/* 2mm.c: this file is part of PolyBench/C */

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <math.h>

/* Include polybench common header. */
#include <polybench.h>

/* Include benchmark-specific header. */
#include "2mm.h"

/* Array initialization. */
static void init_array(int ni, int nj, int nk, int nl,
                       DATA_TYPE *alpha,
                       DATA_TYPE *beta,
                       DATA_TYPE POLYBENCH_2D(A, NI, NK, ni, nk),
                       DATA_TYPE POLYBENCH_2D(B, NK, NJ, nk, nj),
                       DATA_TYPE POLYBENCH_2D(C, NJ, NL, nj, nl),
                       DATA_TYPE POLYBENCH_2D(D, NI, NL, ni, nl))
{
  int i, j;

  *alpha = 1.5;
  *beta = 1.2;
  for (i = 0; i < ni; i++)
    for (j = 0; j < nk; j++)
      A[i][j] = (DATA_TYPE)((i * j + 1) % ni) / ni;
  for (i = 0; i < nk; i++)
    for (j = 0; j < nj; j++)
      B[i][j] = (DATA_TYPE)(i * (j + 1) % nj) / nj;
  for (i = 0; i < nj; i++)
    for (j = 0; j < nl; j++)
      C[i][j] = (DATA_TYPE)((i * (j + 3) + 1) % nl) / nl;
  for (i = 0; i < ni; i++)
    for (j = 0; j < nl; j++)
      D[i][j] = (DATA_TYPE)(i * (j + 2) % nk) / nk;
}

/* DCE code. Must scan the entire live-out data.
   Can be used also to check the correctness of the output. */
static void print_array(int ni, int nl,
                        DATA_TYPE POLYBENCH_2D(D, NI, NL, ni, nl))
{
  int i, j;

  POLYBENCH_DUMP_START;
  POLYBENCH_DUMP_BEGIN("D");
  for (i = 0; i < ni; i++)
    for (j = 0; j < nl; j++)
    {
      if ((i * ni + j) % 20 == 0)
        fprintf(POLYBENCH_DUMP_TARGET, "\n");
      fprintf(POLYBENCH_DUMP_TARGET, DATA_PRINTF_MODIFIER, D[i][j]);
    }
  POLYBENCH_DUMP_END("D");
  POLYBENCH_DUMP_FINISH;
}

/* Main computational kernel. The whole function will be timed,
   including the call and return. */
static void kernel_2mm(int ni, int nj, int nk, int nl,
                       DATA_TYPE alpha,
                       DATA_TYPE beta,
                       DATA_TYPE POLYBENCH_2D(tmp, NI, NJ, ni, nj),
                       DATA_TYPE POLYBENCH_2D(A, NI, NK, ni, nk),
                       DATA_TYPE POLYBENCH_2D(B, NK, NJ, nk, nj),
                       DATA_TYPE POLYBENCH_2D(C, NJ, NL, nj, nl),
                       DATA_TYPE POLYBENCH_2D(D, NI, NL, ni, nl))
{
  int i, j, k;
  DATA_TYPE zero = SCALAR_VAL(0.0);

#pragma scop
  /* D := alpha*A*B*C + beta*D */
  for (i = 0; i < _PB_NI; i++)
    for (j = 0; j < _PB_NJ; j++)
    {
      tmp[i][j] = zero;
      for (k = 0; k < _PB_NK; ++k)
        tmp[i][j] += alpha * A[i][k] * B[k][j];
    }
  for (i = 0; i < _PB_NI; i++)
  {
    for (j = 0; j < _PB_NL; j++)
    {
      D[i][j] *= beta;
      for (k = 0; k < _PB_NJ; ++k)
        D[i][j] += tmp[i][k] * C[k][j];
    }
#ifndef NO_PENCIL_KILL
    __pencil_kill(tmp[i]);
#endif
  }
#pragma endscop
}

int main(int argc, char **argv)
{
  /* Retrieve problem size. */
  int ni = NI;
  int nj = NJ;
  int nk = NK;
  int nl = NL;

  /* Variable declaration/allocation. */
  DATA_TYPE alpha;
  DATA_TYPE beta;
  POLYBENCH_2D_ARRAY_DECL(tmp, DATA_TYPE, NI, NJ, ni, nj);
  POLYBENCH_2D_ARRAY_DECL(A, DATA_TYPE, NI, NK, ni, nk);
  POLYBENCH_2D_ARRAY_DECL(B, DATA_TYPE, NK, NJ, nk, nj);
  POLYBENCH_2D_ARRAY_DECL(C, DATA_TYPE, NJ, NL, nj, nl);
  POLYBENCH_2D_ARRAY_DECL(D, DATA_TYPE, NI, NL, ni, nl);

  /* Initialize array(s). */
  init_array(ni, nj, nk, nl, &alpha, &beta,
             POLYBENCH_ARRAY(A),
             POLYBENCH_ARRAY(B),
             POLYBENCH_ARRAY(C),
             POLYBENCH_ARRAY(D));

  /* Start timer. */
  polybench_start_instruments;

  /* Run kernel. */
  kernel_2mm(ni, nj, nk, nl,
             alpha, beta,
             POLYBENCH_ARRAY(tmp),
             POLYBENCH_ARRAY(A),
             POLYBENCH_ARRAY(B),
             POLYBENCH_ARRAY(C),
             POLYBENCH_ARRAY(D));

  /* Stop and print timer. */
  polybench_stop_instruments;
  polybench_print_instruments;

  /* Prevent dead-code elimination. All live-out data must be printed
     by the function call in argument. */
  polybench_prevent_dce(print_array(ni, nl, POLYBENCH_ARRAY(D)));

  /* Be clean. */
  POLYBENCH_FREE_ARRAY(tmp);
  POLYBENCH_FREE_ARRAY(A);
  POLYBENCH_FREE_ARRAY(B);
  POLYBENCH_FREE_ARRAY(C);
  POLYBENCH_FREE_ARRAY(D);

  return 0;
}
